Move stuff around

* The krita file filter plugins are moved to krita/plugins/formats.
They depend on the various krita libraries anyway, unlike, frex,
the kword filters, and we too often forgot to check them when changing
krita's api
* rename the awkwardly named viewplugins to extensions, in line with
the README in the plugins dir (which got extended with the remaining
plugin types
* move the painterly framework to extensions -- it feels more logical
in that place.
* move the
svn path=/trunk/koffice/; revision=951222